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D. FRANK'HARTFORD, OF BOSTON, MASSACHUSETTS.4 Leners Patent No. 72,632,and Dagmar 24, 1867.5

IMPROVEMENT-IN STRINGING BOW- DRILL STOCKS.

TO ALL WHOM IT MAY OONCERN:

Be it known that I, D. FRANK HARTFORD,`0` Boston, in theA county ofSuffolk, and State of Massachusetts, have invented certain new anduseful Improvements in the Method of Stringing Bow-Drill Stocks; and Ido hereby declare that the following is a full and exact descriptionthereof, reference being had tothe accompanying drawings, and tbelettersof' reference marked thereon. y

l The nature of my invention consiste in a. peculiar method of Stringinga bow-drill stock, and applies particularly to the bow-drill stock,patented by ine, August 27, 1867, Patent'NiL 68,071.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construetion and use, In thedrawings- Figure isa. perspective view of my bow-drill stock.

Figure 2 shows 'in elevation vthe stem D'and-the pulleys AB, with thefour stringsH H H" H" a.ttnched Figure 3 is a section of one of thepulleys.

Figure 4 is "a plan of one ofthe pulleys.

YThe bow-drill stock isso arranged by means of the pulleys A B and theiradjunct, that the reciprocating motion of the bow will produce aconstant circular motion of the stem always in the same direction, ashas been fully explained in the specific-ation of Letters Patent grantedto me, August 27, 1867, and numbered 68,071.

The pulleys-A and B are each provided With two grooves, as shown in lig.2. Each of' these grooves has string, one end of which is permanentlyattached to the pulley. I attach theend ofthe string, by passing itvthroughs. smallhole, z, figs. 1, 3, and 4, and making n. knot, Abut theend of the string Ina-y be attached to the pulley in a variety of ways.l

invention consists in using four strings, one end of' en ch of which isattached to the bow, while the other ends are attached to the pulleys.

The advantage of nay-method Yof' stringng'is that there can be no slip.

Having thus described my invention, I will noivrproceed to set forth myclaim.

What I claim as my invention, and desire to secure by Letters Patent ofthe United States, is-

. Combining and arranging the four strings H H H H" 4with the pulleys AB, .when said pulleys Work substantially as4 described, and for thepurpose set forth..

' D. FRANK HARTFORD.

Witnesses:

FRANK Gr. PARKER, A. HUN Banny.

